Wire cutting device



May 23, 1&33 5 p z 1,910,627

WIRE CUTTING DEVICE Filed Jun 7, 1932 .l-n enliclr' Er'u:

unlz 4 2/4 Patented May 23, 1933 ERIC PERCIVAL MUNTZ, OF HAMILTON, ONTARIO, CANADA WIRE CUTTING DEVICE Application filed June '7, 1932. Serial No. 615,940.

My invention relates to improvements in wire cutting devices and has been particularly evolved for manually cutting hard rod or wire of the type commercially known as high carbon wire. A further object of my invention is to produce a wire cutter which is of simple and compact form capable of being readily manipulated by one man and also of sturdy construction to withstand hard and continuous usage.

Another and very particular object of my invention is to construct a wire cutter for use in cutting off the ends of wires used for 1 form tying purposes in concrete construct on work wherein the cutter has to be of sutllciently compact form so that it may be inserted into the comparatively small recesses in the face of the concrete work and through which the wires project, the cutter being designed to have a bearing against the face of the concrete work whereby the wire to be out is subjected to a simultaneous cutting and pulling action. ,My invention consists of a wire cutting device constructed and arranged all as herelnafter more particularly described and illustrated in the accompanying drawing in which:

Fig. 1 is a longitudinal cross sectional view through my wire cutting device showing it applied toa wire end projecting from the .face of a fragmentary portion of concrete.

Fig. 2 is a transverse sectional view through my device, such section being taken through line 2-2, Fig. 1.

Fig. 3 is a reduced perspective view of a fragmentary piece of concrete showing one of the form tie wires projected from a recess in the face of the concrete and,

Fig. 4 is a similar view to Fig. 3 showing my wire cutting device applied to the end of the wire.

Like characters of reference indicate corresponding parts in the different views of the drawing.

My device comprises a substantially cupshaped housing 1 having its inner end 2 of I a 0 I truncated conical form and opening into a central orifice 3 in the bottom 4 of the housing.

Interiorly of the housing 1 I furnish a slidable plunger 5, the inner end of which is also of truncated conical form and adapted to freely fit within the portion 2 of the housing. The plunger 5 is formed with a central bore 6 which is in an alignment with the orifice 3 and through which the inserted wire to be cut extends. The plunger 5 is formed in the vicinity of its inner end with a plurality of radial slots 7 which extend from the bore 6 to its outer face and in which wire cutting jaws 8 are slidably contained.

The slots 7 and consequently the jaws 8 are preferably of triangular, quadrilateral or oval cross section so that the jaws are held against rotation in the slots. From this construction it will be seen that as the plunger 5 is moved inwardly within the tapered portion of the housing 2 that the jaws 8 will be moved inwardly towards the bore 6 through the contact of their outer ends with the sloping wall of the housing. The inner ends of the jaws 8 are of chisel form so that they bite into the wire.

For moving the plunger 5 within the housing 1, I thread the inner face 9 of the open end of the housing 1 and insert a plug 10 thereinto, the plug being of reduceddiameter at its inner end 11 to correspond to the abutting end 12 of the plunger 5 which is also of reduced diameter. These two portions are surrounded by a spiral compression spring 13 which bears against the shoulders formed by such reduced portions and which tends to move the plunger 5 inwardly within the easing 1. -The plug 10 is formed at its outer end with a handle 14 by which it is rotated and its inner end bears against the plunger 5 so that when it is screwed inwardly it moves the plunger 5 inwardly, thus causing the jaws 8 to move towards the bore 6 and bite into the contained wire.

In order to produce a pulling action upon 9 the wire at the point of severance as well as a cutting action, I furnish a draw plate 20 adapted to bear against the face of the concrete and having a threaded orifice 15 through which the housing 1 projects, the outer face 16 of the housing being threaded. The open end of the housing 1 carries a handle 17 by means of which the housing is rotated in the draw plate.

As my invention has been particularly devised for use in cutting off tie wire ends in concrete work I shall describe its application for this purpose. I have found that high carbon wire is particularly suitable for tying forms in concrete construction work and it will be understood that when it is so used the tie wires remain within the concrete and project from the face thereof when the forms are removed. If the tie wires merely projected from the unbroken face of the concrete it will be understood that it would be only possible, though very difficult, to cut off the wire ends flush with the concrete which H would leave the ends of the wires exposed to the weather, thus causing rust marks in and deterioration to the face of the concrete.

In order to obviate this occurrence and to overcome the obvious difficulty of cutting off wires flush with the face of the concrete, tapered metal or wooden plugs are positioned upon the inner faces of the forms around the wires 21 so that when the forms are moved these plugs are also removed leaving recesses 18 within the face of the concrete through which the wires project. The wires are cut off intermediately of the depth of the recesses and such recesses are then filled with concrete whereby the ends of the wires are covered.

In cutting off the wire prior to the filling of a recess 1 loosen the plug 10 in the casing 1 to permit a free movement of the plunger 5 and then insert the end of the tie wire into the orifice 3 from which it extends through the bore 6 in the plunger 5 and also through the bore 19 in the plug 10. As the tie wire is quite stiff and not readily susceptible to bending it, upon insertion, will, through its bearing against the jaws 8, push the plunger 5 towards the plug 10 thus permitting the aws 8'to move apart and the wire to slide between them into the bores 6 and 19. The housing 1 is then pushed along the wire until it enters the recess 18 in the concrete.

When the housing 1 is in its adjusted position for the severance of the wire with the draw plate 20 lying against the face of the concrete the handle 14.- is turned to move the threaded plug 10 inwardly against the plunger 5 so that the plunger 5 is moved into the tapered portion 2 of the housing 1, thus causing the jaws 8 to be forced inwardly and bite into the wire. As soon as it is felt that the jaws 8 have bitten into the wire the handle 17 is turned to move the casing 1 outwardly through the plate 20 which is bearing against the concrete and the handle 14 is simultaneously turned to increase the bite of the jaws 8 upon the wire so that the wire at the point of the severance is subjected to a simultaneous cutting and pulling action. The provicarbon wire as used in concrete construction work it will be appreciated that it is susceptible'to manyoth'er useswherein it is desired to manually sever hard wire without great exertion, and although I have shown a particular embodiment of my invention it is to be understood that I can make such changes and alterations as I may from time to time deem necessary without departing from the spirit of'my invention as set forth in the appended claims.

What I claim as my invention is:

1. In a wire cutting device of the character described, a housing having a wire receiving orifice therein, a conical cup formed within the housing and adapted to receive the inserted wire, a bored plunger contained within the cup and in the bore of which the wire is received,a wire cutting jaw contained within the plunger to bear against the wallof the cup and the wire, and means for actuating the plunger relatively to the cup to move the jaw against the wire.

2. In a wire cutting device of the character described, a housing having a wire receiving orifice therein, a conical cup formed within the housing and adapted to receive the inserted wire, a bored plunger contained within the cup and in the bore of which the wire is received, a wire cutting jaw contained within the plunger to bear against the wall of the cup and the wire, and a movable element threaded into the housing and bearing against the plunger to actuate it relatively to the cup and move the jaw against the wire.

3. In a device for cutting wire protruding from a wire supporting element, a housing having a wire receiving orifice therein, a conical cup formed within the housing and adapted to receive the inserted wire, a bored plunger contained within the cup and in the .bore of which the wlre is received, a wire severing jaw contained within the plunger substantially transversely to the wire to :be severed and bearing against the wall of the cup and the wire, means for actuating the plunger bore of which the wire is received, a wire severing jaw contained within the plunger sub stantially transversely to the wire to be severed and bearing against the wall of the cup and the wire, a movable plug threaded into the housing and bearing against the plunger to actuate it relatively to the cup and move the jaw against the Wire, and a draw plate adapted to bear against the wire supporting element and having an orifice therein through which the cutter housing is threaded.

5. In a device for cuttitng wire protruding from a wire supporting element, a housing having a wire receiving orifice therein, a conical cup formed within the housing and adapted to receive the inserted wire, a bored plunger contained within the cup and in the bore of which the wire is received, a wire severing jaw contained within the plunger substantially transversely to the wire to be severed and bearing against the wall of the cup and the wire, a movable plug threaded into the housing and bearing against the plunger to actuate it relatively to the cup and move the jaw against the wire, a compression spring interposed between the plunger and the plug, and a draw plate adapted to bear against the wire supporting element and having an orifice therein through which the cutter housing is threaded.

6. In a device f0 cutting wire protruding from a wire supporting element, a housing having a wire receiving orifice therein, a conical cup formed within the housing and adapted to receive the inserted wire, a bored plunger contained within the cup and in the bore of which the wire is received, a plurality of wire severing jaws contained within the plunger and lying in a plane substantially transverse to the wire to be severed and bearing against the wall of the cup and the wire, means for actuating the plunger relatively to the cup to move the jaws against the wire, and a draw plate adapted to bear against the wire supporting element and having an orifice therein through which the cutter housing is threaded.

ERIC PERCIVAL MUNTZ. 

